*{
  padding: 0;
  margin: 0;
}
html,body{
  font-size: 62.5%;// 1rem = 10px
}
@media only screen and (max-width: 1080px) {
  html,body{
    font-size: 71.4%;// 1rem = 71.4/62.5*10 px
  }
}
@media only screen and (max-width: 720px) {
  html,body{
    font-size: 83.3%;// 1rem = 83.3/62.5*10 px
  }
}
.link-btn{
  color: #fff;
  font-family: PingFangSC-bold;
  font-size: 1.6rem;
  padding: 0 5px;
  cursor: pointer;
}
